| .TH IM_DIF_STD 3 "10 May 1991" |
| .SH NAME |
| im_dif_std \- calculate the mean and the standard deviation of the difference image for a given displacement vector |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| int im_dif_std(im, xp, yp, xs, ys, dx, dy, mean, std) |
| .br |
| .B IMAGE *im; |
| .br |
| .B int xp, yp, xs, ys; |
| .br |
| .B int dx, dy; |
| .br |
| .B double *mean, *std; |
| |
| .SH DESCRIPTION |
| .B im_dif_std() |
| calculates the mean and the standard deviation of the difference image |
| created by the displacement vector (dx,dy) on the box (xp,yp;xs,ys) defined |
| on the image pointed by im. More specifically the difference image is |
| of an image given the dispacement vector (dx, dy) is defined as follows: |
| For each point of the original image, the start of the vector (dx,dy) is |
| set on that point. The difference image at this point is defined as the |
| difference of the values pointed by the vector (end value - start value). |
| The function returns the mean and the standard deviation of the |
| difference images measured on the area (xp,yp;xs,ys) of im. |
| |
| Input im should be one band unsigned char image and it should |
| have been set by a call to im_mmapin(3) or im_setbuf(3). |
| |
| .SH RETURNED VALUES(3) |
| The function returns 0 on success and -1 on error. |
| .SH SEE\ ALSO |
| im_cooc_matrix(3), im_glds_matrix(3) |
| .SH COPYRIGHT |
| .br |
| N. Dessipris |
| .SH AUTHOR |
| N. Dessipris \- 10/05/1991 |
